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AR-15 Gas Tube Leakage?

This is a discussion on AR-15 Gas Tube Leakage? within the M16 AR15 forums, part of the Rifle Forum category; My gas tube is "leaking". I think. I noticed there was residue on the gas tube up around the front sight. I wiped it off ...


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Old December 19th, 2006, 07:58 AM   #1
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AR-15 Gas Tube Leakage?

My gas tube is "leaking". I think. I noticed there was residue on the gas tube up around the front sight. I wiped it off and it looked like gas residue. I then stuffed a paper towel into the hole in the heat shields and fired several more rounds. The paper towel had fresh residue on it.

How much leakage should be considered a problem?

I looked at an exploded diagram and I see there is no o-ring or gasket to seal this off and unless the tube expands to fill the hole in the FSB there is bound to be some leakage.

I am just wondering if the problems that I have been having with this rifle could be related to this and if so what do I need to do to fix it.

Thanks for any help.

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Old December 19th, 2006, 10:02 AM   #2
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My Bushmaster upper also had residue around the FSB, but this never caused any malfunctions or reliability issues. A LOT of gas would have to escape in order for it to cause issues, I would think. My heat shields had a lot of residue, too, but, like I said, my upper ran fine.

I have a couple of quesitons for you:

1) What is the make of your upper?
2) What's the barrel length?
3) What type of "issues" are you having? Failure to feed rounds? Short-stroking, i.e., carrier not going all the way back in order to pick up a fresh round? Etc.


Last edited by urbanM14; December 19th, 2006 at 11:39 AM.
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Old December 19th, 2006, 11:10 AM   #3
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It's not totally uncommon for them to bleed out some. After awhile, the carbon will build up and seal it off anyway.

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Old December 19th, 2006, 12:40 PM   #4
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Bushmaster upper.

Standard A2 upper with a 14.5 bbl with phantom FH.

Standard A2 Lower.


I have had problems with the rifle periodically not ejecting the previous fired case and catching it between the carrier and the front of the rifle while trying to push the next round into the chamber.

Also, I had to turn my windage 21 clicks to the left to get on paper at 25 yards.

I am just not feeling that warm and fuzzy with this rifle. My AK and my M1A and Glock pistols I can count the number of malfunctions that I have had on all 3 on both hands with fingers left over. I don't have enough digits to count all my malfs on this AR. If this is just indicative of the system then I guess I will live with it, otherwise I would like to fix it. I really like the ergonomics and handling of the AR but right now if the SHT proverbial Fan I would not pick up that rifle, even if I knew there would be a better chance of finding usable ammo and parts.

Thanks for your help.

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Old December 19th, 2006, 03:42 PM   #5
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Quote:
Originally Posted by bigbucktn
Bushmaster upper.

I have had problems with the rifle periodically not ejecting the previous fired case and catching it between the carrier and the front of the rifle while trying to push the next round into the chamber.
You may want to purchase the black D-ring which increases extractor force. Here's a vendor:

http://www.mgimilitary.com/store/ind...&products_id=4

I also found a thread over at ARFCOM wherein they diagnosed a similar issue to yours:

http://www.ar15.com/forums/topic.html?b=3&f=66&t=255253

Quote:
Also, I had to turn my windage 21 clicks to the left to get on paper at 25 yards.
A lot of Bushmaster FSB were canted resulting in excessive use of windage to get on target. Bushmaster knows this maybe they can fix it for you.

ETA: Actually, the guy below me is correct. Bushy has a tendency to overtorque barrels, which results in the FSB being canted thereby needing excessive windage in order to correct this issues.

I used to buy BUSHY now I will only buy BRAVO company uppers, when they're available!

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Old December 19th, 2006, 03:43 PM   #6
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As far as your rear sight goes... Your upper needs to be fixed. If it is still under warranty from Bushmaster, have them fix it. Spec for the rear sight to zero windage is +- 12 clicks. 21 is too much. The problem is that whoever installed the barrel torqued it too much and bent the index pin canting the barrel. The fix is easy, they just replace the index pin and reinstall the barrell correctly.

The gas leakage around the front site shouldn't be a problem unless it's excessive.

The ejection problem could be that the gas port itself is not large enough for a 14.5 barrel and not enough gas is getting to the bolt carrier. It could be a multitude of other things though. You might want to cruise by the troubleshooting forum on AR15.com. There are actual experts there that can help you. http://www.ar15.com/forums/forum.html?b=3&f=66

Cheers,
Chris

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Old December 19th, 2006, 09:32 PM   #7
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Here's a reliability kit for ya from E.A.G.:

http://www.eagtactical.com/prd_detail.asp?ProdID=5

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